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diff --git a/layout/reftests/async-scrolling/sticky-pos-scrollable-5.html b/layout/reftests/async-scrolling/sticky-pos-scrollable-5.html
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+<!DOCTYPE HTML>
+<html reftest-async-scroll>
+<body>
+ <div style="width:400px; height:300px; overflow:scroll; scrollbar-width:none; border:2px solid black"
+ reftest-displayport-x="0" reftest-displayport-y="0"
+ reftest-displayport-w="800" reftest-displayport-h="2000"
+ reftest-async-scroll-x="0" reftest-async-scroll-y="150">
+ <!-- In this test the position:sticky element has already been adjusted by
+ the main thread paint, and then clamped by the bounding container. The
+ async scroll causes a reduction in that adjustment, but by less than
+ the amount of the scroll (because of the clamping). -->
+ <div style="height: 500px; margin-top: 250px; margin-bottom: 250px">
+ <div style="width: 100px; height: 300px"></div>
+ <div style="position:sticky; width: 100px; height: 100px; bottom: 50px; background-color: green"></div>
+ </div>
+ </div>